Q. 65.0( 2 Votes )

You are having five solutions A, B, C, D and E with pH values as follows:

A = 1.8, B = 7, C = 8.5, D = 8 and E = 5

Which solution would be most likely to liberate hydrogen with magnesium powder?
A. Solution A and B

B. Solution A

C. Solution C

D. All of the above

Answer :

When magnesium powder reacts with HCl, it forms magnesium chloride and liberated hydrogen gas.


The reaction that takes place is:


Mg + 2HCl MgCl2 + H2


As we know that HCl is a strong acidic solution. The pH of acidic solution is less than 7. Being a strong acid, the pH of HCl is 1.8.

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